Compilare: user.cpp: In function ‘int main()’: user.cpp:80: warning: comparison between signed and unsigned integer expressions user.cpp:36: warning: unused variable ‘x’ user.cpp:36: warning: unused variable ‘z’ user.cpp:40: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:42: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:36: warning: ‘in’ may be used uninitialized in this function